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The image formats most commonly used for printing are the Tagged Image File Format (TIFF) and the Joint Photographic Experts Group (JPEG). TIFF formats are generally preferred because they are lossless. That means that the image consists of all the pixels and resizing the image doesn't result in the loss of data. In contrast, JPEG loses data whenever it is resized. While this lost data is not visible to the naked eye, it can show up in printing. Whichever format you choose for your book cover design, it is essential to make sure that your cover images are of a high resolution, 300 dots per inch (DPI) or more. Low resolution images (at 76 or 92 DPI) are of insufficient quality for printing and will tend to look blurred or grainy.